i remember back when i was on campus getting my degree i took a night course and most of the people in there were older folks who worked full time, had kids and were living the grown persons life. meanwhile i was still living that carefree, study hard/party harder life. interestingly enough, that class was one of my favorites because everyone contributed and i learned a ton.
it's never too late to better yourself. if going back to school is what you want to do, go back, focus, attain new knowledge and start your new career.